If I do pull the trigger on a G43X, this is one I’d consider trying.

Best thing I can say is....Iffy. I have bought a couple of Bianchi holster in the past few years that claimed to fit my gun and were not even close. Bought a Model 5 Black Widow for SP-101. I had to stretch the crap out of it to get it to snap over the hammer. Quality has gone downhill since JB sold the company to Safariland.
For the same amount of money, look at DeSantis or Winthrop.